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20 Apr 2009

Volume 94, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 94, 161105 (2009); http://dx.doi.org/10.1063/1.3119666 (3 pages)

Artur R. Davoyan, Ilya V. Shadrivov, Andrey A. Sukhorukov, and Yuri S. Kivshar
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Galvanotactic and phototactic control of Tetrahymena pyriformis as a microfluidic workhorse

Dal Hyung Kim, David Casale, László Kőhidai, and Min Jun Kim

Appl. Phys. Lett. 94, 163901 (2009); http://dx.doi.org/10.1063/1.3123254 (3 pages) | Cited 9 times

Online Publication Date: 20 April 2009

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A eukaryotic ciliate, Tetrahymena pyriformis, has been controlled using galvanotaxis and phototaxis in a low Reynolds number fluidic environment. A cell-tracking algorithm demonstrates the controllability of Tetrahymena pyriformis under two types of external stimuli. Electrical stimulation, in the form of a direct current electric field through the containing fluid, causes a change in swimming direction toward the cathode. Photostimulation, by high intensity broadband light, results in a rotational motion of the cells. The motivation of this work is to progress further with biological microfluidic actuators and sensors for use in engineered systems.
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47.85.Np Fluidics
47.61.-k Micro- and nano- scale flow phenomena
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.61.Fg Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS)

Superhydrophobic cellulose-based bionanocomposite films from Pickering emulsions

Ilker S. Bayer, Adam Steele, Philip J. Martorana, Eric Loth, and Lance Miller

Appl. Phys. Lett. 94, 163902 (2009); http://dx.doi.org/10.1063/1.3120548 (3 pages) | Cited 12 times

Online Publication Date: 22 April 2009

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Inherently superhydrophobic and flexible cellulose-based bionanocomposites were fabricated from solid stabilized (Pickering) emulsions. Emulsions were formed by dispersing cyclosiloxanes in water stabilized by layered silicate particles and were subsequently modified by blending into a zinc oxide nanofluid. The polymer matrix was a blend of cellulose nitrate and fluoroacrylic polymer (Zonyl 8740) precompatibilized in solution. Coatings were spray cast onto aluminum substrates from polymer blends dispersed in modified Pickering emulsions. No postsurface treatment was required to induce superhydrophobicity. Effect of antiseptic additives on bionanocomposite superhydrophobicity is also discussed. Replacing cellulose nitrate with commercial liquid bandage solutions produced identical superhydrophobic coatings.
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87.85.Rs Nanotechnologies-applications
82.70.Kj Emulsions and suspensions
68.08.Bc Wetting
87.85.J- Biomaterials

Mechanics of membrane instability in biological cells

Yong-Wei Zhang

Appl. Phys. Lett. 94, 163903 (2009); http://dx.doi.org/10.1063/1.3126024 (3 pages) | Cited 1 time

Online Publication Date: 24 April 2009

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A model is presented to show that the cell membrane supported by viscoelastic cytoplasm and driven by the periodic actions of the extensile force due to actin assembly and the contractile force due to myosin complex can create periodical mechanical instabilities, leading to giant periodic membrane lateral undulations and causing cell membrane instability.
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87.16.dm Mechanical properties and rheology
87.15.La Mechanical properties
87.14.E- Proteins
87.16.dj Dynamics and fluctuations
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